Yesterday I had a little trouble with MakerWare holding my USB ports hostage, and I promised an update when it was resolved.
MakerBot Support got back to me within hours, and it was an easy fix. MakerWare runs a background service called conveyor: turning this service off (Services -> Stop Conveyor) freed up the USB ports and now I can run ReplicatorG again.
Relaunching MakerWare gets you this error dialog:
So I’m guessing that conveyor doesn’t actually control Makerbot’s not-yet-released heated conveyor belt, but rather is the service responsible for running multiple simultaneous slices?
I might give MakerWare another shot this weekend and see if I can get a print going. Updates as they happen.